问题标题:
如图所示,已知AB=AC,BD=CD,DE⊥AB交AB延长线与E,DF⊥AC交AC延长线与E.求证DE=DF
问题描述:
如图所示,已知AB=AC,BD=CD,DE⊥AB交AB延长线与E,DF⊥AC交AC延长线与E.求证DE=DF
金陵回答:
证明:连接AD∵AB=AC,BD=CD,AD=AD∴△ABD≌△ACD(SSS)∴∠BAD=∠CAD∵DE⊥AB,DF⊥AC∴∠AED=∠AFD=90∴△AED≌△AFD(AAS)∴DE=DF或:证明:连接AD∵AB=AC,BD=CD,AD=AD∴△ABD≌△ACD(SSS)∴∠BAD...
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